Any tiny attachments to make eyeglasses findable?

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Does anyone sell attachments to put onto small household objects -- especially eyeglasses -- paired with some sort of tool to help find them when misplaced? I located the EyeWhere device (http://eyewhereinc.com/order.asp); does anyone have any feedback on that device? The EyeWhere clearly has a battery in the part attached to the eyeglass; I was hoping that there could be some sort of passive device that was much smaller for doing the task.

Something like a tiny RFID chip would be super. Are the RFID transceivers all way too expensive to make this feasible? I found a patent on putting RFID in glasses ( http://www.faqs.org/patents/app/20080218684 ), but no information about any retail sales.

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